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  1. Replies
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    Well at least try not to get killed, ok? :D

    Well at least try not to get killed, ok? :D
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    Completely agree. It's pretty sure there is a...

    Completely agree. It's pretty sure there is a bad connection along the heater string somewhere. You can visually inspect and check resistance and everything might look good but still can't deliver...
  3. Is this double-sided circuit board?

    Is this double-sided circuit board?
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    198

    Yes it's too high. You want to be using a 50 or...

    Yes it's too high. You want to be using a 50 or 60 watt bulb.
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    I'm not sure the point of that, I'm sure we can...

    I'm not sure the point of that, I'm sure we can agree to call it average or RMS and mean the same thing, it's just semantics and does not affect the question about the formula.
    As far as I know, if...
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    The top post links to a thread on another forum. ...

    The top post links to a thread on another forum. That thread has a couple different Herzog schematics. Randall mentioned the one with the int. and ext. fuse, so I posted that schematic in post #5....
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    In this case (DSL1) they don't offer any ext....

    In this case (DSL1) they don't offer any ext. jacks (head or combo) and specifically warn about possible OT failure if used with loads below 16 ohms. They don't seem that confident about it, and I'd...
  8. I think when you plug into the footswitch jack...

    I think when you plug into the footswitch jack with an open cable (no footswitch) it may be normal for it to mute.
    The problem may still be a faulty footswitch.
    The easiest thing right now for you...
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    Maybe you can buy the same 'grade' replacement...

    Maybe you can buy the same 'grade' replacement bulbs direct from Fender. ;)
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    If you hear a hiss that goes away when you turn...

    If you hear a hiss that goes away when you turn the volume to zero, that is sound.
    Turning up the hiss with the volume control is going to make the idle current increase. It's not really idling...
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    You are not answering the question about what you...

    You are not answering the question about what you are hearing through a speaker.
    Any hum, or frequency above or below our hearing will change the tube idle current when the master is not at zero....
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    So there is no sound or hum that increases when...

    So there is no sound or hum that increases when volume is turned up?
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    Here is the schematic: ...

    Here is the schematic: https://music-electronics-forum.com/attachment.php?attachmentid=54045&d=1560974103
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    They don't balance out all that perfect. What...

    They don't balance out all that perfect. What are the idle DC voltages across those 3.9ohm resistors at the emitters of T3 and T4?
    In the music man, they are biased for around 25mV across each. ...
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    Yep, there are more than one set of ZD1 and ZD2. ...

    Yep, there are more than one set of ZD1 and ZD2. We're talking about the ones in the footswitch circuit. ;)
    See around the footswitch jack on pg.3 of schem.
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    The Fu type is fusible, the F type is flameproof....

    The Fu type is fusible, the F type is flameproof.
    Someone has upgraded R71 from the original flameproof design, to a temperature dependent type. It may have been a factory improvement, or someone's...
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    You might be looking at it backwards. ;) (why is...

    You might be looking at it backwards. ;) (why is tube conducting more when volume is raised above zero)
    Hum or oscillation could be reasons.
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    You might find 'liquid tape' at a hardware store....

    You might find 'liquid tape' at a hardware store. It's not as good and may take a couple layers. The important spec. is dielectric strength in V/mil, corona dope is around 4000, liquid tape more...
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    I would try replacing the plate resistor. It's...

    I would try replacing the plate resistor. It's already high, and may be going higher only when subjected to voltage.
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    Pete Traynor also liked this trick. And his...

    Pete Traynor also liked this trick. And his YBA-3C is the only amp I'm aware of that called for a particular voltage across that shared screen resistor to set the bias. So biasing according to...
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    Have you tried the new Boss RE-20 pedal? A bit...

    Have you tried the new Boss RE-20 pedal? A bit pricey, but not compared to what the used RE-201's are going for!
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    As far as I know, the loading is not considered...

    As far as I know, the loading is not considered significant.
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    It seems to go both ways on this, I don't know if...

    It seems to go both ways on this, I don't know if there is a legal requirement. Modern Fenders have the switch first. I've seen some people argue that this way, if someone forgets to unplug the amp...
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    Please recheck whether bass and treble work when...

    Please recheck whether bass and treble work when running the send to another amp. They are the only controls before the send jack.
    This is a more readable schematic:
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    I think the bolded part here may be the most...

    I think the bolded part here may be the most critical reason why this method is not reliable. You need a verified load resistance.

    Have a look at this graph. The lower curve (and numbers on the...
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    This was posted here recently.

    This was posted here recently.
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    There are a few versions, this seems to be the...

    There are a few versions, this seems to be the one you are discussing.

    https://music-electronics-forum.com/attachment.php?attachmentid=54003&d=1560739230
    54003
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    Gar drew some funny symbols that were um...

    Gar drew some funny symbols that were um unconventional. ;)
    For him, a circle with an x is usually a switch.
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